spring AbstractHttpReceivingTransportHandler 源码

  • 2022-08-08
  • 浏览 (414)

spring AbstractHttpReceivingTransportHandler 代码

文件路径:/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/AbstractHttpReceivingTransportHandler.java

/*
 * Copyright 2002-2022 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.socket.sockjs.transport.handler;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;

import org.springframework.http.HttpStatus;
import org.springframework.http.HttpStatusCode;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.sockjs.SockJsException;
import org.springframework.web.socket.sockjs.transport.SockJsSession;
import org.springframework.web.socket.sockjs.transport.session.AbstractHttpSockJsSession;

/**
 * Base class for HTTP transport handlers that receive messages via HTTP POST.
 *
 * @author Rossen Stoyanchev
 * @since 4.0
 */
public abstract class AbstractHttpReceivingTransportHandler extends AbstractTransportHandler {

	@Override
	public boolean checkSessionType(SockJsSession session) {
		return (session instanceof AbstractHttpSockJsSession);
	}

	@Override
	public final void handleRequest(ServerHttpRequest request, ServerHttpResponse response,
			WebSocketHandler wsHandler, SockJsSession wsSession) throws SockJsException {

		Assert.notNull(wsSession, "No session");
		AbstractHttpSockJsSession sockJsSession = (AbstractHttpSockJsSession) wsSession;

		handleRequestInternal(request, response, wsHandler, sockJsSession);
	}

	protected void handleRequestInternal(ServerHttpRequest request, ServerHttpResponse response,
			WebSocketHandler wsHandler, AbstractHttpSockJsSession sockJsSession) throws SockJsException {

		String[] messages;
		try {
			messages = readMessages(request);
		}
		catch (IOException ex) {
			logger.error("Failed to read message", ex);
			if (ex.getClass().getName().contains("Mapping")) {
				// e.g. Jackson's JsonMappingException, indicating an incomplete payload
				handleReadError(response, "Payload expected.", sockJsSession.getId());
			}
			else {
				handleReadError(response, "Broken JSON encoding.", sockJsSession.getId());
			}
			return;
		}
		catch (Exception ex) {
			logger.error("Failed to read message", ex);
			handleReadError(response, "Failed to read message(s)", sockJsSession.getId());
			return;
		}
		if (messages == null) {
			handleReadError(response, "Payload expected.", sockJsSession.getId());
			return;
		}
		if (logger.isTraceEnabled()) {
			logger.trace("Received message(s): " + Arrays.toString(messages));
		}
		response.setStatusCode(getResponseStatus());
		response.getHeaders().setContentType(new MediaType("text", "plain", StandardCharsets.UTF_8));

		sockJsSession.delegateMessages(messages);
	}

	private void handleReadError(ServerHttpResponse response, String error, String sessionId) {
		try {
			response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
			response.getBody().write(error.getBytes(StandardCharsets.UTF_8));
		}
		catch (IOException ex) {
			throw new SockJsException("Failed to send error: " + error, sessionId, ex);
		}
	}


	@Nullable
	protected abstract String[] readMessages(ServerHttpRequest request) throws IOException;

	protected abstract HttpStatusCode getResponseStatus();

}

相关信息

spring 源码目录

相关文章

spring AbstractHttpSendingTransportHandler 源码

spring AbstractTransportHandler 源码

spring DefaultSockJsService 源码

spring EventSourceTransportHandler 源码

spring HtmlFileTransportHandler 源码

spring SockJsWebSocketHandler 源码

spring WebSocketTransportHandler 源码

spring XhrPollingTransportHandler 源码

spring XhrReceivingTransportHandler 源码

spring XhrStreamingTransportHandler 源码

0  赞